Stock-head.



No. 685,332. Patented Oct. 29, mm.

. A. HULSBEBG.

STOCK HEAD. (Application fl1ed Ma.y 23, 1901.)

Qlolddel.)

Inventor:

= TNE nqnms Papas 410., PNDTD-LITHO., WASHINGTON o c UNIT D STATES PATENT OFFICE.

AUGUST HULSBERG, OF BARMEN, GERMANY, ASSIGNOR TO AUGUST BEHLING AN D EWALD MENGEL, OF BARMEN, GERMANY.

STOCK-HEAD.

'sPEcI'FroAT'ioN forming part of Letters Patent No. 685,332, dated October 29, 1901.

Application filed May 23, 1901. Serial No. 61,551. (No model.)

To all whom it may concern:-

Be it known that I, AUG'UsT HiiLsBERG, a subject of vthe King of Prussia, Emperor of Germany, and a resident of Barmen, Prussia, Germany, have invented new and useful Improvements in Stock-Heads, of which the following is a specification.

This invention has for its object to provide a thread-cutter stock-head with cutting-dies that automatically disengage when the desired thread has been cut to allow the work to be withdrawn Without having to unscrew it through the dies and differs from analogous stock-heads in the novel construction of the cutting-dies, their disengaging and setting arrangements, and in the provision of a catch in connection with an adjustable screw-spindl'e serving as a stop against which the piece of work strikes.

This invention is illustrated in the accompanying drawings, in which- Figures 1 and 2 are end elevations of the thread-cutting head with the cover=plate removed and with the dies set and disengaged, respectively. Figs. 3 and 4 are vertical longitudinal sections of the thread-cutting head corresponding to the two positions of the dies in Figs. 1 and 2. Fig. 5 is a transverse section of the cylinder at A B in Fig. 3. Fig. 6 is a detail of the setting and stopping gear. Fig. 7 is aplan of the thread-cutting head with setting and stopping gear removed. Fig. 8 is a plan of the setting-rin g. Figs. 9 and 10 are plans of the head corresponding to the positions of the dies in Figs. 1 and 2, respectively.

The construction is as follows: The-cylinder Ct is formed at its lower end with a flange or head b, with guides c for the dies (1, between which springs e are provided. A longitudinal groove f is cut in the cylinder at and a corresponding groove f in the plate b, which receive a rod g, carrying a stop-piece h at the foot end and at the other end a sockethead 01, through which is passed the screwspindle k, that projects into the cylinder a. Beneath the head 6 is arranged a ring I, which encompasses the guides c and is provided with a handle m. The set screws n for the dies d are recessed through the ring Z. A notch .e' is provided in the top face of the ring I to receive the stop-piece h, and at the side the top of the screw-spindle 7a, which is adjusted in the socket t by means of the nut s. In this sleeve a hook t is fastened for the attachment of the spiral spring 10, the other end of which is secured to the top end of cylinder at.

The action is as follows: When the dies (2 are set, as shown in Fig. l, the stop-piece h rests in the notch z in the ring Z, because the rod g is held in its lowest position by the pull of the spring a. The hook-shaped spring q, secured to the plate I), is also loaded by the pin 0 in the ring Z, as shown in Fig. 9. If the screw-spindle 7c is set in such a position by means of the nut s thatthe distance from its lower extremity to the dies is equal to the length of thread to be cut on the work W and if the work is screwed through the dies until its end comes into contact withv screw- .spindle It, the pull of the spring a will be overcome and the spindle 76 will be slightly forced out of the cylinder a in the direction of the arrow, as shownin Fig. 4. As the spindle 7c is connected to the rod this latter is also moved, and with it the stop-piece h, which is thereby lifted out of the notch z in the ring 1, releasing the ring Z, which is rotated by the spring g on the head I). Hereby the die set-screws n, which up to this moment have been resting on the projections 20 of the dies d, glide off the projections, as shown in Fig. 2, so that the springs e, arranged between the dies, are released and force the dies apart, and the piece of work W can be withdrawn out of the stock-head without having to unscrew it through the dies.

Before fresh work is introduced between the dies the ring Z is turned back by means of the handle m until the stop-piece it comes over the notch 2, when it is caused to fall into the same by the action of the spring u. By turning the ring back to its former position the setscrews it slide onto the projections w of the dies d and, overcoming the pressure of the springs 6, force them together to the working position shown in Fig. 1.

Having now particularly described and as certained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A screw-cutting stock-head with automatically disengaging dies so characterized that two dies (Z are mounted to slide between two guides c forming part of the head I) on the stock-head cylinder a, which dies are held in their closed position by a ring Zencompassing the guides c, mounted to turn and provided with set-screws n which press up against projections w on the dies 61 and hold them in their closed position, which ring 6 is locked, by means of a stop-piece h connected to an adjustable stop-spindle 70 that serves to adjust the length of thread to be cut on the work W in the interior of the stock-head, the stop-piece h resting in a notch z of the ring land holding the same until the rod, on which the thread is being out, comes against the spindle 7c and lifts the stop-piece h, thereby releasing the ring Z which turns under the action of a spring and opens the dies substantially as described.

2. In a screw-cutting stock-head the combination of sliding dies and an inclosing cylinder provided with guides for them, with a ring surrounding the guides and dies and adapted to turn, attachments'of the said ring bearing on the said dies, an adjusting device for regulating the length of screw to be cut and a stoppiece connected to said device and locking the said ring until the said work comes in contact with the said device and removes the stop-piece, freeing the ring substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribih g witnesses.

AUGUST I'IULSBERG'.

Witnesses:

OTTO KONIG, G. A. SCHADDE, Jr. 

